Successful microwave assisted synthesis of
guar –g-polyacrylamide; a copolymer was done
by V. Singh et al.without any catalyst.
Reaction results concluded greater grafting
ratio (66.66%) as compared to (49.12%)
grafting obtained by conventional method.
Grafted copolymer was characterized using IR,
1H- NMR, XRD and TGA. O-Carboxymethyl-Ohydroxypropyl
guar gum (CMHPG) is a
hydrophilic hydrogel commercially available
with different DS value to prepare controlled
colon drug delivery systems. To enhance its
thermal characteristics Shi et al.grafted Poly
(N-isopropylacrylamide) (PNIPAAm) side chain
on polymer. Solubility .phase transfer
behaviour, grafting ration of these new polymer
graft copolymer was characterized in aqueous
media. J. Biswal et al.discover novel route
for grafting of acrylamide on GG using high
energy gamma radiations. Comparison of
microwave assisted and radiation induced
grafting was studied. FTIR, XRD, TGA, SEM
results indicated more thermal stability of new
grafted co-polymer as compared to native gum.
Comparison between conventional redox
grafting and microwave assisted grafting of acrylamide on carboxymethylated guar was done by Sagar Pal et al.